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. J. E. DUNCAN. v REVB'RSING MECHANISM. No. 352,862. PatentefdNqv'. 16, 1886.;

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No. 352,862. Patented Nov. 16, 1-886;

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. REVERSING MECHANISM. N0. 352,862. Patented Nov. 16,1886v min/teas ea- J-h-uen-o 54/. KM. V I

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JAMES E. DUNCAN, OF DUNBAR, ASSIGNOR OF ONE-HALF TO ARTHUR BARING-GOULD, OF LISBON, DAKOTA TERRITORY.

REVERSING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 352,862, dated November 16,1886.

Application filed May 18, 1886.

To all whom, it may concern:

Be it known that I, JAMES E. DUNCAN, a citizen of the United States, residing at Dunbar, in the county of Sargent and Territory of Dakota, have invented certain new and useful Improvements in Reversing Mechanisms, of which the following is a specification.

My invention relates to improvements in motion-reversing mechanisms, and has for its object the provision, in a device of the class named, of means whereby any desired extent of stroke (within certain limits) may be imparted to a reciprocating bed for different desired purposes-as, for instance, for use in metal planing and slotting machines in connection with the tool-holders thereof.

To the accomplishment of the above the in vention consists in the construction, arrangement, and combination of the several parts for operating mechanism shown in Fig. 2.

Referring to the drawings, in which similar letters of reference denote similar parts, A designates the main or driving shaft, preferably having an axial bore, a, in which is placed and operates in longitudinal direction a shaft, B, that is provided with a key, b, which projects through a slot, a, formed in the shaft A, for a purpose hereinafter described. The shaft A is journaled in bearing blocks G, that project upwardly from the main bed 0 at each side thereof.

D designates a driving-wheel mounted upon the shaft A, near one end thereof, and partially covering the slot (1 of said shaft. I provide that the aperture at the middle or hub of the driving-wheel shall tightly fit the driving-shaft, and form in said hub a key-seat, d, the sides of which are in alignment with the sides of the slot a, to permit the free backward Serial No. 202,552. (No model.)

and forward motion of the key b of the shaft B, for reasons presently to be explained.

E E designate spur-gear wheels, which are loosely mounted upon the shaft A, upon opposite sides of the wheel D, and bearing against the hubs thereof. One of said gear-wheelsto wit, E-is of greater diameter than the remaining wheel E, and engages and rotates an equal-sized spur-gear wheel, F, that is rigidly secured upon one end of a short shaft, F, journaled in bearing-blocks F that project from the bed 0 in advance. of the bearingblocks 0, as shown.

F designates a spur gear-wheel, which is rigidly secured upon the shaft F, at the end opposite that upon which the wheel F is secured. The wheel F is equal in diameter to the wheel E and operates in alignment therewith.

G designates a reciprocating rack-bar, that operates above and in engagement with the wheels E and F to move said wheels in unison, as hereinafter set forth. The bar G moves in guide slots g, formed in bearing-blocks G, that project from the bed 0'.

I provide the hubse e of the wheels E E with short key-seats e e", to receive the key b of the shaft B. I preferably prolong the hub e of the wheel E at one side thereof, and provide the exterior of said prolongation with screw-threads epreferably square in crosssection'that is engaged by a pin, h, depend ing from a table, H, mounted upon aframe, H, that operates back and forth in guideslides H formed in blocks H that project from the bed 0. I provide one end of the shaft B, below the table H, with a projecting screw-threaded stud, b, that receives a nut, B.

I designates a leaf -spring secured at one end to the frame H, and projecting thence inwardly to a point between the shoulder b and the nut B.

The operation of the device is as follows:

[ the spring I strikes against the shoulder b of the shaft B, forcing said shaft inward, and its key I) into engagement with the keyseat of the wheel E, whereby the above-described motion of the gear-wheels will be reversed, said shaft A operating the wheel E through the gear-wheels E 1? F and rack G, to move the table outward,which movement will cause the spring to be brought into contact with the nut B, by which the movements of the gear-wheels :o and rack-bar will be changed tothose first described. By adjusting the nut B nearer to or farther from the shoulder b the table H may be caused to move back and forth to a greater or less distance, as will be readily apparent.

: 5 In Fig. 8 I have shown a modification of the rack employed to give backward rotation to the wheel E, such modification consisting in idle-gear wheels N N, properly j ournaled upon the bed 0, and in gear with each other and the gear-wheels F and E.

The device herein shown and described may be employed advantageously in connection with different machines-as, for instance, in metal planers and shaping machines in which case the cutters may be secured to the table H and move therewith.

Without limiting myself to the exact construction of parts herein described, I claim- 1. In combination, a hollow shaft, a drivingo wheel mounted thereon, continuously-rotating oppositely-moving spur-gear wheels upon said shaft at opposite sides of said driving-wheel, and means, substantially as descri bed, whereby the movement of said spurwheels is reversed,

L5 as and for the purpose set forth.

2. A hollow shaft having a key-slot, a driving-wheel mounted thereon, and continuouslyrotating oppositely-moving spur-gear wheels upon said shaft at opposite sides of said driv- 50 ing-wheel, in combination with a shaft placed within said hollow shaft and provided with a key adapted to continuously engage said driving-wheel and to engage said spur-gear wheels alternately, substantially as described.

55 3. A hollow shaft having a key-slot and a shaft therein provided with a key, in combination with a driving-wheel mounted upon said hollow shaft, spur-gear wheels upon said shaft at opposite sides of said driving-wheel,

5o andmeans, substantially as described, whereby said key is maintained in continuous engagement with said driving-wheel and is brought into alternate engagement with said spur- ,wheels, as and for the purpose set forth.

i5. 4. In combination, a hollow shaft having a key-slot, a shaft therein provided with a key, a driving-wheel mounted upon said hollow shaft in constant engagement with said driving-wheel, continuously-rotating spur gear wheels upon said shaft at opposite sides of said driving-wheel, and means, substantially as described, to move said'key alternately into engagement with said spur-wheels and to rotate said wheels in opposite directions, as and for the purpose set forth.

5. In a device for converting motion, ahollow driving'shaft having a slot, a key-shaft having a key placed and operating within said hollow shaft,aspur-gear wheel loosely mounted upon said hollow shaft and provided with a screw-threaded boss or hub, in combination with a traveling table, substantially as described.

6. A hollow shaft havinga slot, ashaft th erein having a key, and continuously-rotating oppositely-moving spurgear wheels loosely mounted upon said shaft and provided with key-seats, in combination with spur-gear wheels rigidly secured to a rotatable shaft, and a rack-bar, as G, substantially as described.

7. In a device for reversing motion,a hollow shaft having a slot, a shaft therein having a key, gear-wheels loosely mounted and continuously rotating in opposite directions upon said shaft and provided with key-seats, in combination with spur-gear wheels rigidly secured to a shaft rotating in a parallel plane with said hollow shaft, rack-bar, as G,and traveling table, as H, substantially as described.

8. In a device for converting motion,atraveling table having a depending pin, as h, in combination with a spur-gear wheel, as E, having a screw-threaded hub, and means, substantially as described, for alternately rotating said wheel in opposite directions to move said table forward and backward.

9. A hollow shaft havingaslot, ashaft thereon having a key, b, and a screw-threaded projection, b, in combination with a spur gear wheel mounted upon said shaft and provided with a screw-threaded boss or hub, and a table, H, provided with a spring, I, substantially as described.

10. In a device for reversing motion, a table, as H, havinga spring, as Land a depending pin, as h, in combination with a spur-gear Wheel, as E, having a screw-threaded hub, as e, and mounted upon a hollow shaft having a key-slot, a shaft within said hollow shaft having a key, as b, and a screw-threaded projection, as b, and an adjusting-nut, as B, substantially as described.

11. In a device for reversing motion,aspurgear wheel, as F rigidly secured to a shaft, as F, in combination with aspur-gear wheel, as E, loosely mounted upon a shaft, as A, and a rack, G, for operating said wheels in unison, and means, substantially as described, to re- IIO verse the direction'of rotation of said wheels.

hollow shaft, in combination with a rotatable shaft, as F, gear wheels, as F F rigidly mounted thereon, rack-barO, and means, substantially as described, for rotating said wheels 5 E E in alternate opposite directions, as and for the purpose specified.

13. A hollow rotating shaft having a key cured upon a longitudinal shaft having a key and held within a rotatable hollow shaft having a key-slot, and oppositely-moving spurgear wheels mounted thereon at opposite sides of a driving wheel, and a reciprocating table having a stop to engage the stop upon the 1ongitudinal shaft to reverse the direction of rotation of said spur-gear wheels, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. r

' JAMES E. DUNCAN. Witnesses:

JOHN J. TULLER, GEO. F. GooDwIN. 

